<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>My WebSocket</title>
</head>
<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<button onclick="doopen()">Open</button>
<div id="message"></div>

<script type="text/javascript">
    var websocket = null;

    doopen();


    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

    function doopen() {

        if(websocket!=null){
            websocket.close();
            websocket=null;
        }
        //判断当前浏览器是否支持WebSocket, 主要此处要更换为自己的地址
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://127.0.0.1:9092/webDemo/ws/chris");
            console.log("websocket",websocket);
            setMessageInnerHTML("open");
            //连接发生错误的回调方法
            websocket.onerror = function() {
                setMessageInnerHTML("error");
            };

            //连接成功建立的回调方法
            websocket.onopen = function(event) {
                //setMessageInnerHTML("open");
            }

            //接收到消息的回调方法
            websocket.onmessage = function(event) {
                setMessageInnerHTML(event.data);
            }

            //连接关闭的回调方法
            websocket.onclose = function() {
                setMessageInnerHTML("close");
            }

            //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
            window.onbeforeunload = function() {
                websocket.close();
            }

        } else {
            alert('Not support websocket')
        }
    }
</script>
</body>
</html>